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GPPS general purpose grade polystyrene (PS)
Date: 2024-06-05 21:42
Views: 10704
Source: Internet
structure and features
GPPS separation structure can as is polyethylene (PE) separation upper 交替 连接 侧苯基. 侧苯基 存 in make GPPS tool has lower structure features: make GPPS separation 子链变 rigid hard, this is is 苯基体积 relatively large, has relatively large retardant 效应, make separation 子链旋转困 difficult. separation 子链变 rigid hard 结果, this make GPPS 玻璃化 temperature degree ratio polyethylene (PE), polypropylene (PP) large large improve/increase, 玻璃化 temperature degree in 90～100℃ between. its and 侧苯基连接 主链 skeleton/framework carbon is for carbon 原子, make GPPS separation 子链存 in 空间异构 phenomenon. due to industrial production GPPS is 无定形 polymer, long is GPPS in random structure, upper can has and other 规, structure. and other 规GPPS already made 备出, polymer therefore formed is can crystallization structure, due to melting point high, flow difficult, difficult processing, its property can very 脆, currently in in to application. generally industrial production GPPS以 random 异构体 is 主, has a small amount of 间规异构体, due to using/adopting free radical polymerization, separation in still generate a small amount of 支链. random 异构体 is and in a small amount of is make industrial 化GPPS can 以无定形存 in basic factors. another 侧苯基 存 in make GPPS ratio polyethylene (PE), polypropylene (PP) chemical upper need active 泼, ring can 进行 特征 property reaction chlorine 化, add hydrogen, 硝化, and other, GPPS都 can 进行. therefore, GPPS chemical resistance and polyethylene (PE), polypropylene (PP) and other chemical upper comparison property polymer. 侧苯基不会 make GPPS generate obvious property, tool has excellent electrical, electrical insulation property can. due to ring is system, make GPPS resistant property relatively high, is ring can make absorption can in ring upper uniform separation 配.
property can
GPPS is color 无臭无味 transparent property rigid hard solid 体, products 掷 时 has metal 般响鸣. GPPS light transmittance low 于88%, degree 约3%, rate relatively large, in 1.59～1.60 between, tool has light property, 但储存时 easy 泛黄. causes is mono pure degree 不够, especially is has micro amount 硫元素时; is polymer in gas in slow aging 引起发黄. GPPS relatively light, density in 1.04～1.065 between. GPPS easy 燃烧, rear 离开火焰 sustainable 燃烧, 火焰呈橙黄, has concentrated 烟. GPPS in thermoplastic property plastics in is type hard plastics, tensile, bending and other force property can high polyolefin, tough property obvious low polyolefin, tensile 时无屈服 phenomenon. GPPS separation 子链虽 is rigid property 链, due to is 无定形 structure, ultra- 玻璃化 temperature degree 即开始 soft 化, soft 化点仅95℃ left right, many force property can to temperature degree rise high obvious effect/influence. GPPS high use temperature degree 仅60-80℃, its specific value and large small has 关, this is is separation basic upper property, separation 子链间 function force small, in hot function lower easy slip 移. GPPS heat deflection temperature (HDT) in 70-98℃ between, and material formulation and hot has 关. for GPPS进行退火处理, not only can improve/increase force strong/high degree, can improve/increase heat deflection temperature (HDT). GPPS is non property polymer, tool has is excellent electrical, electrical insulation property can, main/primary electrical property can indicators tool has relatively excellent value, dielectric constant is 2. 45-2.65. GPPS can resistant acid, acid, acid and 10%-36% salt acid and other machine acid and concentrated degree small 于25% 乙 acid, 10%-90% 甲 acid and other has machine acid 浸蚀, can resistant many alkali and salt 腐蚀, resistant oxidation acid, 例如硝 acid and oxidation agent 腐蚀.
made 备
GPPS is styrene is mono free radical polymerization or type polymerization made. production methods has polymerization method, solvent liquid polymerization method, polymerization method and emulsion polymerization method and other. currently industrial production using/adopting main/primary is polymerization method and polymerization method.
本体 polymerization method
will styrene mono 体送入预 poly in, again add a small amount of additives and agent, 于95～115℃ lower add hot 搅拌进行预 polymerization,待转化 rate to 20%～35%之 rear, again belt/tape has device reaction device inner 进行连续 polymerization reaction. polymerization temperature degree improve/increase to 170℃ left right,以达 to full 转化. a small amount of reaction styrene from 塔顶放出,并 can recycling again use. polymer from 塔底出 material,经 extrusion pelletizing formed product, packaging rear 出厂.
悬浮 polymerization method
以 styrene is mono 体, water is 介质,以明胶 or powder, polyethylene (PE) alcohol, 羟乙基 fiber and other 保护胶 or carbon acid 镁, silicon acid 镁, acid and other solvent property machine salt and other is dispersant,顺丁烯二 acid 酐- styrene copolymer salt is dispersant,以 oxidation 苯甲酰 is agent, in 85℃ left right 进行引发 polymerization. can use agent, in high pressure polymerization in 于100℃ above high temperature lower high temperature polymerization. polymer 经洗涤, separation 离, drying 即 无 color transparent fine resin.
processing molding
GPPS is thermoplastic property plastics in easy molding processing product types 之一, not only can suitable multiple molding process, tool has many good process features. GPPS can using/adopting injection molding, extrusion, hot molding, 旋转模塑, blow molding, foaming and other multiple molding process, its in injection molding, extrusion, foaming is using/adopting process methods. GPPS吸 wet rate very small, in 0.02%-0.3%, molding processing front generally need drying 工序. GPPS is 无定形 polymer, obvious melting point, from 开始熔 melt flow 至开始 obvious separation understanding temperature degree scope/range wide, molding temperature degree scope/range wide. GPPS shrinkage rate and its scope/range relatively small, generally in 0.2%-0.8% between, has molding dimensions degree relatively high and dimensions relatively stability products. GPPS products easy generate internal stress, this is is in molding 时 剪切 force function lower, separation easy orientation, in products cooling stage/phase, orientation separation 子链尚未 to 松弛, melt already cooling to 玻璃化 temperature degree lower, make orientation 冻结. injection molding is GPPS important molding methods, can according to products and thick different, in very large scope/range inner adjustment melt temperature degree. injection molding can in screw injection molding machine, can in 柱塞式 injection molding machine upper 进行. using/adopting screw injection molding machine 时, melt temperature degree is in 190-230℃ scope/range. GPPS can extrusion molding sheet/plate 材, rod and film. extrusion molding generally using/adopting deep degree 渐变 渐变 type screw, screw long ratio in 17～24 scope/range, pressure shrink ratio in 2-4 scope/range, material temperature degree is 150-200℃. GPPS can using/adopting foaming molding made hot temperature products and packaging materials. will GPPS resin made formed has foaming agent pellets 形式, is can property polystyrene (PS). this type of can property pellets can to 任何形状 molding tool in, add pressure add hot can foaming formed is requirements products.
application
GPPS due to easy, transparent, processing properties good, insulation property excellent, easy printing and color, applications 广泛. GPS injection molding products surface gloss degree high, tool has good dimensional stability, product 精致美观, used for industrial and day active in. automotive lamp covers, device surface, chemical device parts, optical device parts, electrical parts, box/case, water bottle, 牙刷, box/case, and other. extrusion molding use GPS versus for separation quality high, this 样便于 products extrusion type, extrusion products has film, pipe/tube, container, sheet/plate, sheet/slice and other, used for chemical industry, packaging, and other 方面. GPPS also can used for electrical, table/sheet outer housing/shell, toys, tool, use electrical appliances, tool, product container, inner outer decoration product, 果盘, optical parts （如三棱镜, 透镜）透镜窗镜 and 模塑, 车灯, electrical parts, electrical frequency electrical container film, high frequency insulation material, electrical machine and other 集装箱, tube/pipe, chemical industry container and other. polymerization resin can made formed different density foam plastics, used as hot, 隔音, anti 震, 漂浮, packaging materials, soft use product, foaming can as water 滤介质 and made light mixed 凝土, low foaming plastics can made formed combined formed 木材做 furniture and other. high heat resistant GPPS resin tool has high transparency, high strength and high heat resistant excellent property can, main/primary used for hot product container and for heat resistant has need 场, temperature degree relatively high add hot water 壶, add hot electrical tube/pipe housing/shell and other.
ring and recycling
GPPS price low 廉, by formed various day use product, 如方便 bag and other. due to GPPS very difficult degradation, in recycling made degree 尚未完善 情况 lower, easy formed ring 境污染, is 常说 “ white 污染”. 如今, 人们越 越 heavy ring 境保护 issues, therefore use this category of products 时, classification recycling, polystyrene (PS) recycling is 6.
